Keithley 3940 Operator'S Manual Download

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Summary of Contents for 3940

Page 1: ...onfains crating srmafion Publication Date March 1991 Document Number 3940 900 01 Rev A...

Page 2: ...RTICULAR USE THE REMEDIES PROVIDED HEREIN ARE BUYERS SOLE AND EXCLUSIVE REMEDIES NEITHER KEITHLEY INSTRUMENTS INC NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR...

Page 4: ...All Keithley product names are trademarks or registered trademarks of Keithley Instruments Inc Other brand and product names are trademarks or registered trademarks of their respective holders...

Page 5: ...2 4V peak are present A good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring Inspect the connecting cables and test leads for possible wear crack...

Page 6: ...ationLocation 2 l 2 2 2 Fan 2 l 2 3 LINE VOLTAGE SUPPLY 2 2 2 3 1 Line Voltage Selector Switch 2 2 2 3 2 Line Receptacle Connection 2 2 2 3 3 LineFuse 2 2 2 4 KANDLINGPRECAUTIONS 2 3 2 5 BASICOPERATIO...

Page 7: ...Operation 3 34 Frequency Sweep Operation 3 34 SECTION 4 GPIB Interface 4 1 4 1 1 4 1 2 4 1 3 4 1 4 4 1 5 4 1 6 4 1 7 4 1 8 4 1 9 4 2 4 2 1 4 2 2 4 3 4 3 1 4 3 2 4 4 4 5 4 6 INTRODUCTION 4 l GPIBOvervi...

Page 8: ...haseRelationship Between Waveform and Synchronous Output 3 27 Figure 3 10 BURSTOscillation 3 28 Figure 3 l 1 TriggerOscillation 3 29 Figure 3 12 GateOscillation 3 29 Figure 3 13 Waveforms and PhaseDef...

Page 9: ...ing Messages 4 18 Table 4 9 Main Synthesizer Sweep Parameter Setting Messages 420 Table 4 10 Miscellaneous Parameter Messages 4 23 Table 4 l 1 ARB Waveform Write and Readout Messages 4 24 Table 412 Pa...

Page 10: ...o variable In addition external signals can be combined with the oscillator output to generate custom waveforms Frequency amplitude waveform and phase can be in dependently set on the sub synthesizer...

Page 11: ...following safety terms and symbols arefound on the instrument or used in this manual The A symbol on the instrument indicates that the user should refer to the operating instructions The WARNING head...

Page 12: ...Model 7007 2 2m 6 6ft j can be used to interface the Model 3940to the IEEE488 bus Model 7051 2 BNC to BNC Cable The Model 7051 2is 5OQBNC to BNC cable RG 58C 2ft 0 6m in length The Model 7051 2is ter...

Page 13: ...ure and humidity conditions Also the environ ment must be free of dust and vibration and the Model 3944 must not be exposed to direct sunlight The Model 3940usesaline filter but pulse noise or strong...

Page 14: ...h the unit is shipped To change the power supply voltage first disconnect the line cord and setthe supply voltage switch in the correct position Wait at least five seconds before turning the power bac...

Page 15: ...ts such as thinner or benzene or chemical dust cloths to avoid damaging caseor front panel surfaces 2 5 BASIC OPERATION The following paragraphs summarize front panel operat ing controls give typical...

Page 16: ...N Sets waveform type main and sub MODE Sets operating mode main only Adds shifted function to scme other keys L Allows sub synthesizer TRIG MAN Manually trf rs unit MARK Selects number of cscillatlon...

Page 17: ...ramming mode The instrument will display the allowable fre quency range for the selected waveform 2 To directly enter a completely new numeric fre quency value key in the desired number followed by th...

Page 18: ...7 8 PressSTOPFREQ and set the sweep stop frequency as desired For example to program a 1OkHz stop frequency press 10 kII2 Press CTR and SPAN to view the center and span frequencies With 1kHz and 1OkH...

Page 19: ...operation of the Model 3940 such as the value of eachparameter and the range of permissible parameter values The keyboard includes aSHIFT key which gives certain other keys secondary functions A key...

Page 20: ...Model 3940 in the sub mode which allows you to set sub synthesizer parame ters The liquid crystal display indi cates SUB in the upper left comer when the Model 3940 is in the sub mode MODIMI Either ke...

Page 21: ...oscillation mode lL and 5 correspond to gateon at falling edgeand gateon at rising edge respectively STOPLEVEL EmI MODal The STOPLEVEL key allows you to select the out put level during the stop cycle...

Page 22: ...ers can also be setus ing waveform period Seethe discussion on the ENTRY keys 5 for information on frequency 0 and period setting START FREQ Startfiequency MODIW l SIZE1 The START FREQ key allows you...

Page 23: ...ut fre quency simply changes between the start fre quency and stop frequency at intervals deter mined by the sweep time With the linear and log functions the frequency increases or decreases linearly...

Page 24: ...l OOOpsec to lO OOO Osec For period based settings the frequency is set to the value of the reciprocal that is rounded to the nearest number below O lmHz Therefore period based setting will cause sign...

Page 25: ...can be entered using p p rms or dBV units Use V or mV for p p units Vrms or mVrms for rms units and of course dBV for dBV units Note that the p p value may vary depending on the waveform when using rm...

Page 26: ...uency aswell asamplitude p p rms dBV dBm conversions When the units key of the unit to be changed is pressed with the current setting dis played the display will be changed to reflect the newly select...

Page 27: ...procedure is in pro gress press the CAL key a second time To cancel calibration operations over the GPIB send the CAB command Other key operations and GMB commands will not be recognized during calibr...

Page 28: ...over the GPIB with the LCK command and GPIB pro gramming is not disabled when the lock is on You can return the unit to local with the LOCAL key even when the lock is ON However you cannot return the...

Page 29: ...nce is approximately 5OQ and it can be use with 5OQterminations 0 13 0 14 0 15 SUB SYNTHESIZER FCTN OUT Sub synthe sizer waveform output This BNC jack provides the sub synthesizer waveform output sign...

Page 30: ...les such asthe Model 7007 are recommended for bus connections 0 16 PHASE SYNC I O Synchronous operation input1 0 18 EXT ADD IN External add input output This BNC connector is designed for applying ex...

Page 31: ...earance be hind the port when installing against a wall When the air filter becomes dirty remove it by pulling the air filter cover and clean the filter with pressurized air or wash it with a mild det...

Page 32: ...ude EXT TRIG IN external trigger in put SWEEPSINGL START IN single sweep start in put and SWEEP HOLD IN sweep hold input Key specifications for these inputs include Input voltage TTL level Allowable m...

Page 33: ...ummarized below Output voltage TTL level Circuits See Figure 3 5 Figure 3 6 and Figure 3 7 Analog Outputs MAIN SYNTHESIZER FCTN OUT Main Synthesizer Waveform Output Maximum output voltage lOV no load...

Page 34: ...lug into a grounded AC power receptacle turned back on 3 4 5 To avoid the possibility of electric shock use only grounded AC receptacles for power connections Turn on Model 3940 power by pressing in o...

Page 35: ...ged when an error occurs Example Changing the waveform type from the current We sme wave to k square wave or to 2 triangular wave Key Operation Display Result PressFCTN Currently selected waveform sIN...

Page 36: ...fying an existing value the modified value will automati cally replace the old parameter value and the current units will remain unchanged When the step size is indicated in the rightmost position of...

Page 37: ...ncy setting above 25MJXz You attempted to specify a main synthesizer period setting outside the allowed range of 0 04pec to 10 OOOsec You attempted to specify a sweep start stop center span or marker...

Page 38: ...load to 23 0dBV no load 2 A 20 0Vp p no load to 0 2Vp p no load 5 7Vrms no load to O lVrms no load u 15 2dBV no load to 24 7dBV no load n IZO OVp p noload to 02Vp p no load lO OVrms no load to O lVrms...

Page 39: ...e sweep setbelow 1octave You attempted to begin a sweep operation with the sweep start frequency and the sweep stop frequency set to the same frequency l You attempted to change the sweep time and the...

Page 40: ...always displayed for the frequency and the frequency accuracy specifications stated in Appendix B apply However the period dis played is the result obtained by rounding off the recipro cal of agiven...

Page 41: ...the waveform is OV Thus thesevalues do not depend on the DC offset value or square wave duty cycle As when setting the frequency you can use MODIFY to change the amplitude The AMl TD key sets the ampl...

Page 42: ...he to tal voltage exceeds lOV open Example An error will occur when you try to set the amplitude to 1OOmVp p open when the DC offset is 5V open The minimum AC amplitude when the total voltage is over...

Page 43: ...3 Operation a bm loltage ov 100m DC Offset Voltage 10m t V open circuit lm im 10m loom 1 AC Amplitude Voltage VP p open IO 100 Figure 3 8 Relational Rangefor Allowed AC Amplifude Voltageand DC Offset...

Page 44: ...veform expressed as a percent age For example a1OkHzsquare wave hasatime period of 1OOlLsec If the high portion of the waveform has ape riod of 30pec the duty cycle is 30 100 x 100 30 Two square wavef...

Page 45: ...synthesizer ascending I Sync output Ll l 1 Main synthesizer square wave with duty cycle fixed at 50 or 1 sub synthesizer square wave I I I I I Main synthesizer ascending sawtooth wave I Descending sa...

Page 46: ...g or gating is not required and the selected mark and space values will have no effect on the output waveform Burst Mode In the burst mode the instrument will generate the se lected waveform for the n...

Page 47: ...internal sub synthesizer sync signal Rising edge 5 and falling edge L signals can be selected for both external and internal trigger sources Note that se lecting internal trigger automatically selects...

Page 48: ...itions for the available waveforms are illus trated in Figure 3 13 The Model 3940 generates the main synthesizer sine wave synchronous output aswell assquare waves with fixed 50 duty factor and their...

Page 49: ...1 2 About 1 2 w i I I i I I O0 O0 180 180 360 360 The shaded portion is the hysteresis area in which the level goes high and low depending on the past value of the phase Main synthesizer square wave o...

Page 50: ...ion stop level 1 5 le oscilliation IFigue 3 15 WaveformExampleswith ResetStopLevel ISYNC Pressing SHIFT Cp SYNC enters the phase sync mode and generates the phase sync pulse The purpose of the phase s...

Page 51: ...f the two signals will be identical O and the two signals will be exactly in phase If both phases are set to 90 the phases will again be identical 90 and the two signals will also be exactly in phase...

Page 52: ...ower than the stop frequency an ascending frequency sweep will be generated If the start frequency is higher than the stop frequency a descending frequency sweep will be generated 3 34 If you specify...

Page 53: ...p SINGL START key Holding and resuming a sweep HOLD RESM key Turning a sweep off to enable normal frequency pro gramming SWEEPOFF key Setting the output waveform to the start frequency START STATE key...

Page 54: ...SECTION 3 Operation Figure3 18 SweepFrequencyand SweepOutput 3 36...

Page 55: ...CONTINUOUS SWEEP HOLD MODE HOLD MODE HOLD IN LOW LEVEL SINGLE SWEEP CONTINUOUS SWEEP OPERATION MODE OPERATION MODE SINGL START IN FALLTIME NORMAL MODE START FREQUENCY OUTPUT MODE STOP FREQUENCY OUTPUT...

Page 56: ...n the stop frequency it is set to 1OVif the start frequency is higher than the stop frequency When the Model 3940is in this mode pressing the PREQ key enables normal frequency programming with the FRE...

Page 57: ...f you set the sweep range based on center and span fre quencies an error may occur depending on the order of parameter selection whether or not the Model 3940is in the sweep execution mode Example To...

Page 58: ...ution of this output signal is 10bits Log Sweep Steps With log sweeps the output frequency is changed every 500psec Frequency update is slower in log sweep than in linear sweep due to the calculations...

Page 59: ...le interface bus and data transfer is performed by three handshake lines enabling reliable data transfer between data send ers talkers and receivers listeners having differing data transfer rates 4 12...

Page 60: ...f data by listeners Control Bus ATN REN IFC SRQ EOI ATN UteNtion This line is an output line from the controller and it indi cateswhether the information on the data bus is to be in terpreted asdata o...

Page 61: ...s high and setsNDAC low completing the handshake 0 8 Indicates that all listeners have completed data input and the bus is ready to transfer the next data byte NRFD Listener 0 Ready for next data byte...

Page 62: ...tion is canceled by any of the follow ing When the device is addressed to talk When the unlisten UNL command is received When the IFC command is received The controller sets the ATN signal to low to a...

Page 63: ...1 N 040 LISTENER ADDRESSES ASSIGNED TO DEVICES LISTENER ADDRESSES ASSIGNED TO DEVICES I TALKER ADDRESSES ASSIGNED TO DEVICES II N X C V RC V TALKER ADDRESSES ASSIGNED TO DEVICES II I 8 MEANING DEFINED...

Page 64: ...2 Specifications Interface Functions Talker mode transmission codes are also in 7 bit ASCII format All letter characters aresentasupper case letters GPIB Primary Address Table 4 2 shows the interface...

Page 65: ...uted In addition the input buffer is cleared when aGPIB error occurs and subsequent program codes are not executed when an illegal header or parameter is found during the interpretation of a program c...

Page 66: ...imal point canbeomitted Leading zeroes and spacesare ignored 0 Sign for positive for negative is assumed if sign is omitted Examples 012 34 50 0 1 8 NR3 Format In the NIX3format numeric values are spe...

Page 67: ...tal five characters NR2 Inquiry ResponseFormat In the NR2 format inquiry response parameters are specified asreal numbers BD DD I l Numeric digits with decimal point l Spacerepresents plus and minus s...

Page 68: ...of data eachof which is made up of two bytes in 2scomplement format Eachdata word is represented in high byte low byte order 4 10 When a sequence of delimited program code that in cludes the SET comma...

Page 69: ...clearsthe SRQsignal line sethigh Table 4 5 summarizes status byte conditions The status byte can be read using serial polling or by sending STS When the status byte is read the follow ing bits are res...

Page 70: ...or stopped Reset 0 Condition Unused therefore always 0 l When status byte is requested with SRQmask reset condition o When DCL or SDC is received l When SRQcauseis cancelled by setting SRQmask l When...

Page 71: ...d 4 3 MODEL 3940 PROGRAM CODES 4 3 1 Model 3940 Parameter Setting Messages Table 4 6 Main Synthesizer Parameter Setting Messages Program Code Function Header Parameter Operation and Setting Range Inqu...

Page 72: ...03 0 36mVrms 50Q to 3 53 00 3 53Vrms 50R Fort n 0 29E O3 0 29mVrms 50Q to 2 88E 00 2 88Vrms 50Ci For k 0 50E 03 0 50mkns 50Q to 5 00E 00 5 00Vrms 50d Resolution O OlmVrtns 50Q Example ATR3 10E 00 3 1V...

Page 73: ...ion O ldBm EiOfi Example ATM 0 2E OO 0 2dBm 50R OFFSET OFS NR3 SetsDC offset voltage V no load Yes Range lO OE OO lOV no load to lO OE OO lOV no load Resolution O OlmV no load Example OFS4 5E 1 0 45V...

Page 74: ...n O lE 06 1OOns Example SBD 1E 2 lOs O OlHz SAV NR2 Setssub synthesizer output amplitude Yes VP p no load Range 0 2 0 2Vp p no load to 20 0 20Vp p no load Resolution O lVp p no load Example SAV 5 OE 0...

Page 75: ...ON SUB SYNTHESIZER EWE Program Code Header Parameter Operation and Setting Range uiry SBF NRl Yes Selectssub synthesizer output waveform Range 1 to5 0 1 2 T 3 I L 4 4 Yes 5 Example SBF2 SEW NR2 Yk Set...

Page 76: ...is EXT Burst Trigger is performed when TRG 0 changes to TRG 1 Gate Gate off when TRG 0 is specified Gate on when TRG 1is specified Range 0 or 1 0 Trigger inactive Equivalent to MAN key off 1 Trigger a...

Page 77: ...panel in remote mode This function be comes effective when trigger source is EXT and TRE 1 is received In local mode it is always effective When remote mode is set again status of previous remote mode...

Page 78: ...olution Ins Example STD l OOE O ls lHz SPF NR3 Setssweep stop frequency Frequency Hz Yes Range O OE OO OHz to 25 0E 06 25MHz Resolution O lmHz Example SPFl OE 2 1OOHz SPD NJ33 Setssweep stop frequency...

Page 79: ...5 0E 06 MHz Resolution O lmHz Example MKF l OE 2 1OOI W NR3 Setssweep marker frequency by period YC S period s Range 40 0E 09 40ns 25MHz to lO OE 03 1OOOOs O lmHz Resolution 1ns Example MKD l OE OO ls...

Page 80: ...evious remote mode is effective SGE1 is set when power is first turned on or when PSTcommand is exe cuted Range 0 or 1 0 In remote mode SINGL START IN connector is dis abled 1 In remote mode SINGL STA...

Page 81: ...RY CALL DIspLAY SUBSYNTHESIZER DI l LAY FCTN SIGNAL ON OFF PANEL KEY Loa ON OFF PWSEL BEE ST0 RCL DSP SDP SIG LCK PST NRl NRl NRl None None NRl NRl None Selectsbeep sound ON OFF Yes Range Oorl 0 OFF 1...

Page 82: ...address 0 for write or readout of ARB waveform WORD I UMBER WDN NRl Number of words for ARB waveform write Yes and readout to be conducted Range 0001to 1024 Example WDN 1024 Performs 1024words of ARB...

Page 83: ...onse off 1 Header is included in inquiry message response on Example HDR 1 3RQ L SK MSK NRl SetsSRQmask Ye 5 Range 00 to 63 32 Error occurred 32 error SRQ 0 No Error SRQ 16 No effect sameas0 8 No effe...

Page 84: ...s l RD NIX3format Yes Mantissa 6 digits Exponent 2 digits Example PRD 3 33333E 03 3 33333ms 3OOHz iikD LmE p p OPEN Output amplitude VP p no load AMV NR3 format Yes Mantissa 3 digits Exponent 2 digit...

Page 85: ...NR3 format Yes Mantissa 3 digits Exponent 2 digits Example ATM 12 4E OO 12 4dBm 50SL OFESET DC offset voltage V no load OFS NR3 format YeS Mantissa 3 digits Exponent 2 digits Example OFS 12 3E OO 12...

Page 86: ...de dVB no load SYNTHESIZERWNCTION Sub synthesizer output waveform SUB SYNTHESIZER SE Sub synthesizer phase deg Program Code SFR SBD SAV SAR SAD SBF SPH Response Format NR3 format Mantissa 10digits Exp...

Page 87: ...the front panel is enabled or not in remote mode Program Code TRS TRG SPL M RK SPC l HS TRE Response Format I Setting NRl format One digit same assetting value Example TRS2 INT x NRl format One digit...

Page 88: ...format Yes Mantissa 6 digits Exponent 2 digits Example SPD3 33333E 03 3 33333ms 3OOHz Wv EEP R FREQUENCY sweep center frequency frequency Hz SWEEPc R PERIOD Sweep center period period s CTF NR3 forma...

Page 89: ...Sweep function SINGL START IN BNC IENABLE Whether or not SINGL START IN connec tor on rear panel is enabled in remote mode STM NR3 format YES Mantissa 4 digits Exponent1 2 digits Example STF1 234E OO...

Page 90: ...Y NR2 format Mantissa 3 digits Example DTY 25 0 25 DYV NRl format 1digit 0 Fixed 50 1 Variable Example DYV 1 Variable ml ON OFF Beep signal ON OFF BEE NRl format 1digit sameassetting value Examule BEE...

Page 91: ...ample FMT 1 Binary STr NRl format Yes 4 digits same assetting value Example STT 0000 Starts write and readout from 0 address W0R Q ER ARB Waveform write or readout word WDN NR1 format Yes 4 digits sam...

Page 92: ...eService Request in Section 4 2 2 Example MSK 32 Specifications All SRQsmasked except error SRQ XATU BYTE Status byte readout OR STATUS Error number readout See 15 Error Cord in Section 7 2 2Speci fic...

Page 93: ...of messagecharac ters is the sameasthe number of characters returned by the corresponding inquiry It takesabout 0 5msec byte for the Model 3940to transfer data in the talker mode Table 4 20 Typical Ex...

Page 94: ...SECTION 4 GPIB Interface Typical Execution Times Cont 4 36...

Page 95: ...Stop Period l eriod s Sweep Center Frequency Frequency Hz Sweep Center Period Period s Sweep Frequency Span Frequency Hz Sweep Frequency Span Periods Sweep Marker Frequency Frequency Hz Sweep Marker...

Page 96: ...tar enable disable in remote mode Miscellaneous HOLD IN connector enable disable in remote mode Square wave duty cycle I Square wave duty cycle 50 fixed Inquiry on whether square wave duty cycle is va...

Page 97: ...be performed WDN 20 WDN 15 ARB waveform readout start Number of words per block for ASCII format ARB waveform readout ARB waveform readout start SET 10 BLK 15 IOUT 50 BLK 10 33B Responseheader ON OFF...

Page 98: ...e Inquiry Message t Main Synthesizer FRQ 12 2 Oscillation frequency Frequency Hz Oscillation Frequency period s Output Amplitude VP p no load Output Amplitude wp p 5w Output Amplitude Vrms no load Out...

Page 99: ...r Source 0 EXTX 1 EXTB 2 INTl 3 INTJ SPH NR2 SPH 4 TRS 15 TRS 1 Panel key function cor responding to MAN 0 Trigger inactive 1 Trigger active TRG NRl TRG 1 Stop Level 0 HOLD 1 RESET SPL NRl SPL 1 Mark...

Page 100: ...2 Sweep Center Frequency Frequency I TZ CTF NR3 CTF 12 2 Sweep Center Period Period s CTD NR3 CTD 6 2 Sweep Frequency Span Frequency Hz SNF NR3 SNF 12 2 Sweep Frequency Span Period s SND NR3 SND 6 2 S...

Page 101: ...ether square wave duty cycle is variable or fixed at 50 Main synthesizer output amplitude calibration Main synthesizer output amplitude calibration stop BeepON OFF Store settings into memory Recall se...

Page 102: ...te and readout start address NRl STT 4 STT WDN SET NRl WDN 4 Number of words for ARB waveform write and readout to be performed ARB waveform write start Number of words for ASCII format ARB waveform r...

Page 103: ...750 ABORT 7 CLEAR 7 REMOTE 702 OUTPUT 702 MSK 3 1 ON INTR 7 GOT0 280 I ENABLE INTR 7 2 INPUT INPUT PROGRAM CODE Cb PRINT PRINT CONMCIND II CB OUTPUT 7021 CO IF POS CB 3 THEN GOSUB 780 FOR I 0 TO 900...

Page 104: ...send program codes to Model 3940 Enables controller SRQinterrupt Inputs program code into C Displays input program code Sendsprogram code to Model 3940 Executes specified subroutine when pro gram code...

Page 105: ...ler and Model 3940 Specifies CRT display SetsC for 80 characters Setstimeout interrupt time to 20 seconds SendsIFC 160 SetsRIZNtrue and sends DCL from control ler SendsSOF sweep on and HDR header on t...

Page 106: ...02 j CB PRINT CB OUTPUT 702 SFN ENTER 702 CB PRINT i C 800 810 820 830 840 850 860 870 880 890 900 910 920 930 940 950 960 970 980 990 I 000 1010 LO20 1030 1040 OUTPUT 702 SPL ENTER 702 CB PRINT I c O...

Page 107: ...roughly tested and inspected and certified as meeting its published specifications when it was shipped from the factory However the typi cal data represents mean values of measurements for each Model...

Page 108: ...OVp p 50 2 load 5OQ and 1 kHz reference frequency Figure A Z Main SynthesizerSine WaveAmplifude Frequency Characteristics Total harmonic distortion 10 100 Ik Frequency Hz 1Ok IOOk Note Amplitude setti...

Page 109: ...open circuit and 1 kHz reference frequency SubSynthesizerSine WaveAmplitude FrequencyCharacteristics Total harmonic distortion w 0 2 0 1 0 05 10 100 ik Frequency Hz 10k 1OOk Note Amplitude setting 20...

Page 110: ...solution 1 Gate 1 GATE 1 Oscillates in units of half cvcles while trieeer sienal is ON I Stop Level HOLD Stops at oscillation start phase RESET Stops at center value of the waveform Not applicable in...

Page 111: ...racy for AC DC Amplitude Frequency In COAI mode 1kHz reference frequency OV DC offset 5OQ load and amplitude setting of Characteristics IOQmVp p to lOVp p for waveforms other than k rms amplitide for...

Page 112: ...t is added summed to main synthesizer waveform output Gain of External Add Input Total set Voltage Beak 1Gain2 OPEN 1v to 1ov 11 1 Gain3 50 3 1 l 2 1OOmV to 1V 1OOmV to 1OmV 1mV to 1OmV Maximum Extern...

Page 113: ...onal synchronous cable Slave pulse to slave unit Operate with clock and I SYNC pulse from the master connector Connect with the optional synchronous cable slave connector master unit Generates SYNC pu...

Page 114: ...TTL Level Input of 74LS14 is pulled up by 4 7kQ Starts single sweep at the rising edge 5ons i BNC receutacle on rear Dane1 Hold input Sweep sync output I 1 Input voltage lTL Level Input to 74LS14 is p...

Page 115: ...ELECTRICAL SPECIFICATIONS CONT Sub Synthesizer Characteristics plitude vs frequency command is given during single pressed or when the GPIB SYiV command is given during slave operation...

Page 116: ...d display with 509 display unit cursor position and step size parameters saved Number of memory units Battery backup 3Voltage display with no load display with 5OQ cursor position and step size parame...

Page 117: ...Center frequency Frequency span Marker frequency Sweep time Sweep function 0000000kHz u Qooooms 1Q 0000000kHz Ipo oops 5OOLKlOOkHz 31 818 0000000kHz lll lllys 0000000kHz Qo0 000ps 1 000s LINA For tri...

Page 118: ...at power on I Operation OFF condition Y Y ON OFF toggles each time the FCTN OUT ON OFF key is pressed Main synthesizer FCTN OUT Signal output will be open circuit SYNCOUT Identical to ON condition Su...

Page 119: ...n the panel and EOI are sent simultaneously Reception CR CR LF CR EOI CR LF EOI or EOI 0 to 30 selected by numeric keys on the panel DIOl to D108 NDAC NRFD SRQ 1Open collector DAV EOI T state Switch w...

Page 120: ...load dBV units in CONT mode AC Amplitude p p Ouput Waveforms L I nfY zo ovp p to P OlVp p 16 9dBV to 3 OdBV 15 2dBV to 4 7dBV P OOVp p to ZOl mVp p 3 ldBV to 23 0dBV 4 8dBV to 24 7dBV ZOO mVp p to ZO...

Page 121: ...2O OmVp p lOOjlVp p 2O OmVp p 2 display P OOmVp p lOI IVP P n f5 C of calibration temp Amplitude Accuracy 1 L All Other output n Waveforms Attenuator Ex i3 l l M 55 l 10 f6 7 l 100 Not Specified l 10...

Page 122: ...amplitude 2 of DC offset voltage 4OmV l l rature within fi C of cali lOOmV 2OmVp p ImVp p O fimVp p When AC amplitude is 2OOmV f 0 5 of AC amplitude 2 of DC offset voltage 2mV When AC amplitude is QO...

Page 123: ...7 Figure B l Outer Dimensionsof theModel 3940...

Page 124: ...3 29 GPIB Handshaking 4 2 GPIB Overview 4 l GPIB Primary Address 4 6 GPIB Specifications 4 l c Codes 4 6 Continuous Mode 3 28 Continuous Sweep 3 35 H HANDLING PRECAUTIONS 2 3 Holding Resuming a Sweep...

Page 125: ...Wave Duty Cycle 3 26 STARTUP 3 16 Start Frequency 3 38 Status Byte 4 12 Stop Frequency 3 38 Stop Level Selection 3 32 Substituting Marker Frequency 3 39 Sweep Frequency and Sweep Output 3 39 Sweep Op...

Page 126: ...e to zero nunstable q Will not readappliedinput q Overload q Calibration only q Datarequired q Certificateof Calibration required attach anyadditionalsheets asnecessary Showablock diagramof your measu...

Page 127: ...ruments SARL l 3 Allee des Garays B P 60 l 91124 Palaiseau ZI l l 6 0115 155 l T x 600 933 l Fax l 6 0117726 NEITIERLANDS Keithky Instruments BV l Avelingen West 49 4202 his Gain m l P O Box 559 4200...

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